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In-pixel ADC for a vision architecture on CMOS-3D technology

Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Domínguez Matas, Carlos; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito · 2010

Abstract

This paper addresses the design of an 8-bit single-slope in-pixel ADC for a 3D chip architecture intended for airborne surveillance and reconnaissance applications. The 3D chip architecture comprises a sensor layer with a resolution of 320 × 240 pixels bump-bonded to a three-tier chip on the 150 nm FDSOI CMOS-3D technology from MIT-Lincoln Laboratories. The top tier is a mixed-signal layer with 160 × 120 processing elements. The ADC is distributed between the top two tiers. The top tier contains both global and local circuitry. The ramp generation is implemented with global circuitry through an 8-bit unary current-steering DAC. The end of conversion at every pixel or processing element is triggered by a local comparator. The digital words are stored in a frame-buffer in an intermediate tier. The area of the local circuitry in the ADC is consumed by the comparator, capable of reaching less than 3 mV of resolution in less than 150 ns with less than 220 μm2, and by the memory cells, each one storing 6 8-bit words along with two additional bits in less than 50 μm × 50 μm. Every ADC conversion is performed in less than 120 μs.

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In-pixel ADC for a vision architecture on CMOS-3D technology

Author: Suárez Cambre, Manuel; Brea Sánchez, Víctor Manuel; Domínguez Matas, Carlos; Carmona Galán, Ricardo; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito
Publisher: Institute of Electrical and Electronics Engineers
Year: 2010
DOI: 10.1109/3DIC.2010.5751464
Source: https://idus.us.es/bitstreams/1abf7fbb-abac-4e7b-8095-0724b9bd88b9/download
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  B5  BE5 / =$/=((   
/235$7
$ + += 9++;  / 
(  = * ( 
//" /$ $  ( 
/(AC
  (   $/  //( 
$(/"=$/(
$/$$$/$//(
 $" / $(   ( 
$$$ ( $$$      
$/      ((  
//$/$(F=/
*((    $/ (   
(?(*/$"
/G/G
* / ? ( /$  (?=@ 
 $  @   * * ?  =
9H25;"((?(
$/9B

;**AEC"
//*((=F=
  $  *   /!( *"
    2B5 I"    // 
   ( ?(   $(  
/$( ? 6 F= $$ ( ? (( 2=

    //   ?   =
/*/"??*
(1#0"?(/
  ((  (   /  
7"//(?

)).)')(124)0320
7 2 (/  $ *?   (
1#0/=$/=((
  $/(   $( "  $
=$("((/
=$  B5
BE5/$(265
2B5 /  / $"  * /  
$((/
 1#0 /  ((  = *
* (  // 
//=($"?
$* /$ . $  $
 $  ( (   
$    $   $  
" $    /$( =  / <
  =  $( " (/$
(=("
(*$(@$*
=J=/
+?/($$$($$$(
( "  $ "   @  (
( /$   
/!($("?
/$=(((
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 $/   *  (   
(   $$ 9+G;  / 
(   $/  / *  (
/" =   !  $$$$$$
(  $/    $/  
   $( "   =  
.$"9?=;"=
 =      * 
 9265  2B5;   $(  $@ 
$/$/(@/=
//$?$(
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2;   $/  ( ?  F= "
( #"(?F= 
(?(
#0*$$$(/6F=(?(
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 /   /$(  * $$   
$(  #  ( ? 
9G;3I$3I$
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 $/  /  /*(( =  = =@
 $/ "? /(  
B33 / 7 B ?    $/  
$/  F=    ( 
/(=/?9265
2B5 / $   $( ;  "
(*=(
7?*?$$(
$/F=//7E
(/"/BK6I$B45I$
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72$*?1#0/"(//
$/9$(;(=
/9(($/;(=(
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7E+F=$$(
/
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73$$
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   $/$(   $$ 
  $$  L * 
( :+  (  $  :+  
/*A3C$/
=((
/$$(
    B E<23 $$ (( 
* $ (  $$ ("    B
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
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"9=
 ;"   ( (J=  
*  /     *  ( 
==@((
*/$

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76**(/
$/(/?
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B33((
(.2626$0*$
   $/     ( 
(?$$((
 (   D   * $  

73(/$*?
  ?   ($  $ 0*
(/=(=
$/$(?(/
(/?/$/(/*((=
    235$ 7  
$++M/$/(.((
(:+
76?$($(
=/$/(973;
$"=J
*
$ 97 B; $ 5  B33
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' *9/
?;(=/$/(J
526N$
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O2EI
*?=2K6@P"(/*
A5E"22C?=/"
?/=
   (   = =@ 
=$/?
   ? "(? 
(/$$=?3=
       =  
?(("$((*
$F=(
 *  / * ?  /   
$$(
1#0/""AE55$"22C
 ("      /$$= 
=2BK/$*(
/ * ( 36 $  (("   B
  /*( /$$= ? 3 = 
  /$  (J  ?( " 
E55$"?Q23+#/?$/
    $ B45 wR ?   ?=
77F42wR?$:
  $/ /(( =  F= 
   = (=(   265  2B5 /
$$("(
=(==?(
 $(   (    /= $
//$*
$/  * /"  =   
$ /*  /$  $/$  =
?$/$(//
1#0/@(74
(  ? ? $/$ (
/((((//=
*!=
?$/$(/
/?(?@?E55
$22M*(?//
   //   $ ?   /
$/((//
(/( ? $$$(   ?
*(?=AE55$"22C?
34(#"?(52EN
*?$/
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& E5 E5 E E E5 E5 E5 E5
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7F?/$/7K
:+?(=
( 5B +# :+  ? (  = =? 552
+#?(=
$@(/$/(*
'($  $ = $/(  ?  
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7F/$/
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$/($$(=
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   /= ?     ((
((=/$/(
:*"(=$"?
($(=*$
"*$?(2B5I"
?*E55*/$/$
(=/*=
(?($/$@$/$
*/$/?(=B2B=
$/?$/?(=345wR
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$(*=*/$
 $J    $/ ( #(" 
/*$(A5E"22C"
B4$(F=
(  =( $/"  * ? ( 
$*(=?.$
$/A6C*(?
$/.
725?$$/$/$(
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725$$/$/$(1#0/
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1#0/$/?@?/
  /" (=  (
"  * ( 
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=./*
 ?  ( ?  
((?$"$/$?
@?=$/$/.".((
?  J ( (   
$//"(
+?  M"
/**9 ;*=<
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    ( /  ($ 
/M *??!""*"
=
 ?     7  ?
$/(   =@ / (  * ?
$/?$/*(
/  ((  (  ( (
($/722(/
$*($/"
?$.*?7
2B"  (= ( * *    66 (#
((.(/*
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726$$((?(
$/
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//((((F=/
/*(=
* (  //   *
$/(?
B5BE5/=$/=((?
L  3 I$  3 I$   235 $ 7 
$++/$(
2652B5/$
$($==$(
   * $ / $  
$  $ @ /$( =    *
"  ( 1#0   //" ?
/(($$$($$$
( 9$ ; ((  /
 $=(((  1#0 (   $/  /
/($(/"=
(($$$($$$M"
 $/   $  /  
$/$( ?  F= $$  
"  $/ ( $$     (
?(    "  $/   $J
(*
 (   =( / ( ? 
$/./$.(
$/*(B4$
BB5I$
B
?$/=?2B57"
(=(1#0/==$(
=*="/$?=?

'070'0:0
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A2C 0:?@/"'(9B((;"
0/$*9B554;
ABC B554   '($/  $(
9'; B554 0( 0$ ' *
/<DD???D+@DB554'DM$B554$
AC - '(%! !.!  "X  /  7
/(X"00/"/
 (  2B23 / B525 (  0 $<
44B6K<252224D2BF335B4
AEC 7J"Y/'$/$
$Y"000Z("
EB"2B"//BK6FBK44"B554
A3C *(#"[25=2)$/D:.
D*Y"000Z("*6""
//23 BE"B552
A6C M ]" $(  0(" ( 0(  !
"Y:? // (   (*  
D*Y"("B55K0B55K0/
BB4B55K"//25K 22B"#:<K4F2EBEEFK6K
A4C $!"#)=")!"[(
   G $/Y" +(<  ^? ($
="B55B
AFC ^ #" :$ Z '" [<  
/Y"/B554
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